1.10-30X40 POWERFUL MAGNIFICATION: Enhanced 10x to 30x magnification, provides wider, clearer and brighter vision. Adjust the magnification of this zoom monocular according to your needs, so you can see the wonderful world in full splendor. 2.WATERPROOF AND FOG PROOF DESIGN: made of aluminum alloy and rubber material, high-purity nitrogen is filled with the compact monocular optics to prevent dust fentering the monocular Make the HD monocular waterproof and anti-fog for any weather and environment. 3.CRYSTAL CLEAR VISION: thanks to the dual focus design, it provides high light transmission, the focusing provides you with brighter and high-contrast images. The eyecup can be rotated upwards to focus the view for itself, and then adjust the focus setting and zoom setting until the image becomes clear. 4.D BIG ANDCOMFORTABLELENS AND EYEPIECE: The monocular telehas BAK4 prism with FMC green film and HD blue film as well as improved 20mm eyepiece lens and 40mm objective lens will expand your horizon and not restrict your view.